https://www.theguardian.com/science/2021/jan/24/the-five-emotional-contagion > The idea that emotions can ‘spread’ from one person to another seems to be taking hold in the psychological world > Last week, scientists from the universities of Oxford and Birmingham published research describing how teenagers’ moods were affected by those of others around them – and that bad moods were more potent. They also found that when a teenager “catches” a low mood from a friend, the friend’s outlook becomes more cheerful.